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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118727 - Powered Converter - Tekonsha
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118727 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (91)
  • Q & A (122)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Powered Converter

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the tail lights on both the driver's side and passenger's side. You will need to remove the tail lights to access this harness.


T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Power Module

A ModuLite power module is built into this T-One connector. With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118727 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Item # 118727

Installation Details 118727 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118727

Average Customer Rating:  4.9 out of 5 stars   (91 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

- 118727
by:
2014 Jeep Grand Cherokee

Good fit on my 2014 jeep and easy installing :) 574064



- 118727
by:
2014 Jeep Grand Cherokee

Best price on the net. Received much more than expected from etrailer ! George and his team made sure I knew when they received order, the day it shipped and the day I received the part. Excellent service. Thank you 427874



- 118727
by:
Jeep Grand Cherokee

This set up is easy to install, and has worked perfectly the entire time. I even purchased an adapter for the original 4 pin, to use it for 7 blades, and no issues whatsoever. The fun part of course is getting the black power wire all the way to the front of the Jeep. Now I will caution that I have at 5.7L Jeep Grand Cherokee Limited and getting the black wire to the battery was a little tricky. I ended up using some fishing wire to get to the undercarriage through the hollow rectangular casing that protects the other sheathed wiring for the vehicle. I have attached a photo for simplification. The rest was as easy to install as the video showed. 737931



- 118727
by:
2019 Jeep Cherokee

The harness itself appears to be of good quality. The connectors are solid hey there’s plenty of wire to feed out through the frame to the lights. The only issue that I see in the instructions is how to connect to the battery. The instructions state to look in the trunk for the battery but unfortunately on the Jeep Grand Cherokee there is no battery in that location. The batteries are located under the passenger seat. You have to run the power wire all the way to the front of the vehicle and connect it to the jump terminal or fuse box in the engine compartment. I would purchase this again. It was nice to just plug the connectors in and not have splice into the cables. 596389



- 118727
by:
2017 Jeep Grand Cherokee

After realizing that I had purchased the wrong wiring harnesses, returning it was painless. There were be complications to speak of. The staff at etrailer.com is top notch. Will continue to use them for all my towing needs. 440605



- 118727
by:

Great product, but give yourself time to install it. The video is way more helpful than the inclosed written instructions. Took me about 2 hours to get the wiring harness installed. Running the wire to the battery took the longest. I ran it along the wiring harness as shown in the video. I would have been lost without the video. Thanks for making this doable for a weekend do-it-yourself type. 697111



- 118727
by:
Jeep

You can’t ask for an easier product to install and it comes with everything you need, with the exception of tools obviously. Followed video instructions and other that me not having a rack to make it easier, I couldn’t have asked for a simpler solution. Install of the wiring took me a little over an hour, and that was me having issues with trying to get my Jeep up on blocks so that I have more maneuverability under the vehicle. 466980



- 118727
by:
2018 Jeep Grand Cherokee

FASTEST DELIVERY EVER... I ordered my parts on Tuesday at 7 p.m. and was at my door on Wednesday at 10 a.m. I have no idea how they did that... very impressed! After seeing their online videos on mounting a trailer receiver and wiring from etrailer and comparing prices, I am convinced the company knows how to run a business. Easy to find information and helpful articles. I'm glad to be a customer. 612025


Comments
great... very pleased. helpful videos that gave me the will to run my own wiring for the tow package.
Dennis R - 05/12/2020

76331

- 118727
by:
2019 Jeep Grand Cherokee

Hitch install was a snap but wiring was not so easy. Took several hrs. and instructions didn't have battery placement correct. It is under the passenger seat not in rear of car and there is an auxiliary battery in the same box complements of the stop start feature.Hooked up wiring to the small motorcycle type battery because to access the main battery, the front seat has to be removed.Still don't know if it is correct hookup. However, all the lights ,brake,directionals and running lights work fine. Dealer where I just bought 2019 Grand Cherokee said the auxiliary battery is only 6 volts and is used to support the stop start feature.Confusing, do you think? 609532



- 118727
by:
2014 Jeep Grand Cherokee

This wiring hooks up perfectly to my 2014 Jeep Grand Cherokee. I didn't give five stars because the box looked like it had been returned from someone else and just taped up. All the hookups were present however and I hooked everything up in about 1.5 hours. The instruction book is not exactly like my Jeep but close enough for someone to figure out if you've done this sort of thing before. If you have to follow instructions step by step, you may need to look this up on the video provided by etrailer or YouTube to fully understand how everything is supposed to be placed. The hardest thing is to run the power wire from the battery terminal in the engine compartment (since the battery is under the passenger seat) and fishing wires up to the taillights (metal coat hanger works good). Pop the inside piece of the two plugs out of the taillights and carefully pull taillight straight backwards. The power module fits perfectly under the vehicle and behind the driver rear tire. The power wire supplied is long enough to run from the passenger side front (positive lug under hood), down to under vehicle, along passenger side to the back, over the rear suspension, and then across to the driver side to hook to the power module. I also had to get the small bracket suggested for the four pin plug holder. Without that, your plug will just hang. All in all a good product if it lasts. I haven't hooked up a trailer yet but we'll see. 503400



- 118727
by:
2015 Jeep Grand Cherokee

trailer wire for grand Cherokee. order this part so I would not have to go back to the dealer to have comp. flashed. took a little longer to get part from ups not abig deal. install went e-z ,worst part was running power to batt. in jeep It works great ! 405060



- 118727
by:

The Curt Class III (C13182) trailer hitch was difficult to install on my 2018 eco diesel Grand Cherokee. I had to drop the DEF tank shield and the DEF tank--which was what I expected. What I didn't expect was the DEF tank shield would not fit back in place after the hitch was installed. You'll need a big hammer to beat the DEF shield back to where it belongs! Unfortunately the videos don't show an installation on a diesel and the instructions gloss-over a diesel installation, only saying the DEF tank and shield need to be dropped in order to install the hitch. On a scale of 1 to 10 with 10 being the most difficult, I would rate this installation as a 6. After the installation was finally completed, the hitch looked good and it works good. 744570



- 118727
by: 10/22/2020

Easy install. 902098



- 118727
by:
2014 Jeep Grand Cherokee

i have not installed yet looks easy enough, my Jeep has factory wiring under vehicle i looked into it, there is a factory type pigtail plug I could purchase through your company not real expensive, my local dealer wanted $200.00 for one hour labor to turn the factory tow package on, i will be still installing this wiring harness, 899733



- 118727
by:
2014 Jeep Grand Cherokee

Easy to install and perfect fit for my 2014 Grand Cherokee Laredo! Great customer service (I ordered wrong wiring kit and they straightened it out) 897884



- 118727
by:
2018 Jeep Grand Cherokee

Easy install! The video on etrailer.com was very helpful with the install since the directions the harness came with weren't detailed enough. Works great! 897597



- 118727
by:

Works great. Was able to install it in my garage. Entire installation took a little over an hour. The Jeep dealer wanted 600 dollars to install the equivalent. 896866



- 118727
by:

869135



- 118727
by:

everything that i needed was delivered on time easy to install worked great! 868817



- 118727
by:

Priced right very easy to install 851857



- 118727
by:

Easy install with no help! 846200



- 118727
by:

I am very happy with the trailer wiring kit purchased from etrailer. It was not hard to install and it fit the lights and vehicle harness just right. It functions perfectly. Thank you 825202



- 118727
by:

This was my second hitch setup I bought from eTrailer. Once again, it was a great experience! Products arrived very quickly and install was a breeze. Even the wiring harness install was relatively easy and the kids and I had fun with the install. I appreciate the detailed instructions provided. One year later, everything is holding up well and we have no issues. I will definitely use eTrailer again. 823019



- 118727
by:

with the help of their friendly customer service dept I got exactly what I needed and after a year of use I have had no problems anything. Everything installed easily and works flawless. Thanks guys. Will be contacting you guys again for my planned upgrades on my custom expedition trailer. 822331



- 118727
by:

Excellent product, easy to install, etrailer provided great instructions and video 814745


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Recommended Trailer Wiring For 2020 Jeep Grand Cherokee Without Tow Package
    For your 2020 Jeep Grand Cherokee I recommend the Tekonsha T-One Vehicle Wiring Harness part # 118727. It's custom made for your Jeep and it gives you a 4 way flat trailer connector so you have all the lights to tow a trailer safely and legally. It gives you your tail light functions, turn signals, and brake lights. The wiring installs behind your tail lights and plugs inline between the factory connector and the light assembly. There is no cutting or splicing of the factory wires, however...
    view full answer...
  • Trailer Wiring for a 2018 Jeep Grand Cherokee Without Factory Tow Package
    If you are just needing a 4-Way flat connector for your 2018 Jeep Grand Cherokee then the part you are looking for is the Tekonsha T-One # 118727. This plugs in behind your tail lights and then draws power for the trailer lights directly from your battery via the 12V power wire. For additional functions which are found on a 7-Way you will then need the Universal Wiring Kit # ETBC7. This comes with an adapter that gives you a 4-Way and a 7-Way connector as well as all of the wiring and...
    view full answer...
  • Trailer Wiring for 2019 Jeep Grand Cherokee With Auto Start/Stop
    I have not heard anything about being limited to using OEM wiring because of the auto start/stop function on your 2019 Jeep Grand Cherokee Limited X. We have installed the Tekonsha T-One Vehicle Wiring Harness # 118727 on multiple Grand Cherokees and not had any issues. The # 118727 plugs directly inline with your tail lights so there's not cutting or splicing involved, and it your Jeep won't have to be taken to the dealer to get to get the ECU flashed since it will work off the...
    view full answer...
  • How to Add 7-Way to 2018 Jeep Grand Cherokee Without Trailer Tow Package
    You are on the right track to adding a 7-way to your 2018 Jeep Grand Cherokee without the tow package, and the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727 will fit your Jeep and is the correct first step. After adding that, if you only need the functions of the 4-flat (turn signals and tail lights) you can simply add the Adapter 4-Pole to 7-Pole # 37185 and tie off the additional wires which would not be needed. If you are looking to use a brake controller...
    view full answer...
  • Recommended Trailer Connector For a 2020 Jeep Grand Cherokee
    We have just what you need, but we will need to look at this two ways. One if you already have a towing prep package and one if you don't. Let's start by figuring that out. I have included a picture showing what the towing prep package connector looks like. It is located at the rear of the vehicle just under the bumper pretty close to the middle but favoring the drivers side slightly. If this is present you simply need Curt T-Connector Vehicle Wiring Harness for Factory Tow Package...
    view full answer...
  • Installation of 4-Way Wiring Harness on 2019 Jeep Grand Cherokee to Upgrade to MOPAR 7-way/4-Way
    Since you don't have the tow package wiring on your 2019 Jeep Grand Cherokee, the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727 is needed. This harness will connect behind your vehicle tail lights and will connect directly to your vehicle battery to protect your electronics from overload. This will give you the 4-way trailer functions you mentioned. Then if you want to use the Mopar plug, you will simply cut the 4-way plug off the end and use the Hopkins...
    view full answer...
  • Trailer Wiring Recommendation for 2014 Jeep Grand Cherokee that Does Not Need to Be Activated
    I have an easy solution that will take care of your trailer wiring on your 2014 Jeep Grand Cherokee with the Tekonsha kit part # 118727. This installs by plugging inline with the taillight connectors of the vehicle and does not integrate with any of the factory wiring so you wouldn't have to go to a dealer or worry about any of their packages being active. I attached an install video for this for you to check out as well.
    view full answer...
  • Parts Needed to Install 7 Way Connector on 2020 Jeep Grand Cherokee without Factory Tow Package
    In order to install a 7 way plug on your 2020 Jeep Grand Cherokee you will first need to install a 4 way connector like the Tekonsha T-One 4 way Trailer Connector # 118727, which will install easily by teeing into your vehicle's lights. Once you've installed your 4 way connector, you can then use the # ETBC7 to install your 7 way connector that will allow you to tow a trailer with brakes. The ETBC7 comes with all of the wiring and parts needed to install a working 7 way on your 2020 Jeep...
    view full answer...
  • Trailer Wiring for 2020 Jeep Grand Cherokee Without Factory Tow Package
    For your 2020 Jeep Grand Cherokee without the factory tow package I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. It's custom made for your Grand Cherokee and will give you all the required lights to safely tow a trailer, tail lights, turn signals and brake lights. It's a plug and play design, so there's no cutting or splicing into your Jeep's wiring. It installs in line with the tail light connectors to get the signals, and then a wire is ran to...
    view full answer...
  • Trailer Wiring for 2020 Jeep Grand Cherokee without Tow Package
    Yes, for your 2020 Jeep Grand Cherokee that isn't equipped with the factory tow package, the Tekonsha T-One Vehicle Wiring Harness # 118727 will work perfectly. This custom harness is going to plug into existing ports behind the tail lights and receive power by running up a hot lead to the Jeep's battery. This will provide you with a reliable 4-Way connector to power the basic signal lights on your trailer. I have attached an installation video below that you can also check out.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 2019 Jeep Grand Cherokee
    Since your 2019 Jeep Grand Cherokee isn't equipped with the factory US Car connector under the bumper then your best option for adding the needed 4-Way harness is with the Tekonsha T-One # 118727. This is still a custom harness that installs by simply plugging into factory ports behind the driver and passenger side tail lights (you will need to remove the tail lights to access the harness). Then as you mentioned, the hot lead will need to be run up to the Jeep's battery. When this type...
    view full answer...
  • Trailer Wiring Recommendation for 2016 Jeep Grand Cherokee without Tow Package
    For trailer wiring that is confirmed as a fit for your 2016 Jeep Grand Cherokee that does not require ECU flashing we have the T-One kit part # 118727 which will install by plugging inline with the factory taillight harnesses your vehicle has currently and does not require an ECU flash. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Trailer Wiring For A 2020 Jeep Grand Cherokee Without Factory Tow Package
    A wiring harness that will fit the bill for your 2020 Jeep Grand Cherokee is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. This wiring will provide that 4 way connection you need to power your bass boat trailer light functions. The kit includes a Powered Modulite to reduce strain on your wiring system and is easy to install behind your Grand Cherokee's tail lights on both sides. Once plugged in the T-connector, run the hot lead up to your car battery....
    view full answer...
  • Will The Tekonsha Wiring Harness Installed On 2019 Jeep Grand Cherokee Void The Warranty
    As long as Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118727 is installed properly the wiring will not void your warranty. You are protected under the Magnuson–Moss Warranty Act which states that manufactures cannot void the warranty of a vehicle simply because of an after-market part unless that part caused the issue. The Tekonsha T-One wiring harness is a custom fit harness for your vehicle so it does not require splicing into the vehicle's electrical...
    view full answer...
  • How to Add a Trailer Connector to a 2019 Jeep Grand Cherokee
    You can easily add a 4-flat trailer connector to your 2019 Jeep Grand Cherokee without the factory tow package, you simply need to add the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. To install this connector you will need to plug the harness into connection points behind your Jeep's tail lights and then run a hot lead to your battery. I have added a link to a video install of this connector on a '19 Grand Cherokee for you to take a look at, as well a link...
    view full answer...
  • Recommended Brake Controller 7-Way Trailer Connector for 2018 Jeep Grand Cherokee
    On your 2018 Jeep Grand Cherokee, you can make your current 4-way a 7-way by adding the wiring kit # ETBC7 and a brake controller. The wiring kit will give you the adapter, the wire, the circuit breakers and the butt connectors needed. I then recommend for your brake controller the Redarc Tow-Pro Elite Trailer Brake Controller # 331-EBRH-ACCV2. This controller is very well made and gives you a clean look in the dash or console of your Jeep. It has both proportional braking ability and...
    view full answer...
  • How to Add a Trailer Connector to 2020 Jeep Grand Cherokee
    Yes, for your 2020 Jeep Grand Cherokee we have the Tekonsha T-One Vehicle Wiring Harness # 118727 that will work perfectly. This custom harness will plug into factory ports behind the driver and passenger tail lights on the Jeep and then you will just need to run the power wire up to the battery. This will provide you with a 4-Way connector to connect with and power the trailer's basic signal lights. I have attached an installation video on the 2019 model Jeep Grand Cherokee that you...
    view full answer...




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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Edited by:
Lindsey S
Video Edited:
Jacob T
Video Edited:
Chris R
Video by:
Dustin K
Video by:
Zach D
Video by:
Jonathan Y
Video by:
Michael B
Installed by:
Cole B
Written by:
Alexander C
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
David F
Updated by:
Isabelle B

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